Final answer:
Andrew Carnegie is most notably associated with the steel industry, specifically in Pittsburgh which is home to the revolutionary Carnegie Steel Factory option (1).
Step-by-step explanation:
Andrew Carnegie is prominently associated with the steel industry and the city, in this case, is Pittsburgh. An immigrant from Scotland, Carnegie made his fortune by establishing the Carnegie Steel Factory in Pittsburgh, and it became a dominant force in the U.S. steel market under his guidance.
His approach was built on a model of vertical integration where he owned all elements of the production chain, from the iron mines to the shipping railroads. This practice revolutionized steel production, making it more economical and high quality.
In addition, Carnegie's operations expanded to include steel factories in other cities such as Youngstown, Ohio. However, the origin and the heart of his steel empire remain largely connected with the city of Pittsburgh. Carnegie's name is not associated with the automobile industry in Detroit, the textile industry in New York, or the oil industry in Houston.
Learn more about Andrew Carnegie and the steel industry